单项选择题

There are still some ______ for students of science and engineering, but those in arts and humanities have been filled.

A．positions
B．vacancies
C．applications
D．categories

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热门试题

单项选择题

The Robogat can quickly get through to the scene of a fire because（）

A．it is in position in the middle of the tunnel
B．it can move on a monorail suspended from the roof of the tunnel
C．it runs on a monorail and can take quick action
D．its modified water main can run along the tunnel quickly

单项选择题

The Robogat is designed to pump water（）

A．at a speed of 500 liters a minute
B．almost as fast as an airport tender
C．six times faster than an ordinary fire-engine
D．at a rate of an airport fire tender